Question

Factor: 9x^2 - 42x + 49
So far I have 3(3x^2 - 14x + ) I have no idea if this is right or if this equation is prime. Or if I'm solving it correctly.

Answer 1

tip

9x^2 - 42x + 49=0

divide through by 9

x^2 - 42x/9 + 49/9=0

then

x^2 - 14x/3 + 49/9=0

then

x^2 - 14x/3 + (7/9)^2=0

x^2 - (2)x7/3 + (7/3)^2=0

compare

(x-a)^2=x^2-2ax+a^2

does this help?

Answer 2

I'm even more confused then before.

Answer 3

2ax+4bx-3ay-6by